KR101912530B1 - Non-sweep analog wideband receiver for real-time receiving - Google Patents

Abstract

The present invention relates to a broadband receiver and, more specifically, to a broadband receiver for extracting a frequency by using a multi-band antenna array, a broadband power coupler, a broadband filter bank, a variable gain amplifier, and a detector, and comparing output voltages of different detectors with respective characteristics of a filter bank and input frequency bands.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a non-sweep type analog broadband receiver for real-

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates generally to analogue broadband receivers, and more particularly, to an analogue broadband receiver using a multiband antenna array, a wideband power combiner, a broadband filter bank, a variable gain amplifier, a detector, For a broadband receiver that compares the output voltage of the detectors and extracts the frequency.

A broadband receiver of the same architecture as a commonly used spectrum analyzer uses a narrowband filter bank at the receiver output and sweeps the frequency of the signal applied to the mixer for frequency downconversion to produce a specific band frequency Output.

However, in the case of receiving unknown microwaves, if the frequency is swept as described above, the frequency can be swept into a wide band once, and the signal can be analyzed after an output at a specific frequency is detected. .

In addition, when it is desired to receive signals distributed in various kinds of broadband in real time, a frequency sweep must be continuously performed in a wide band, so that there is a disadvantage that a specific frequency signal can not be received in a specific section of the sweep time.

Such a wideband receiver has a problem that the hardware configuration is complicated and a vast amount of signal processing capability is required for signal processing.

1. Korean Published Patent No. 10-2016-013048 (November 11, 2012)

The present invention has been proposed in order to solve the problems according to the above background art, and it is an object of the present invention to provide a multi-band antenna array, a wideband power combiner, a wide band filter bank, a variable gain amplifier, It is an object of the present invention to provide a broadband receiver that compares output voltages of different detectors to extract frequencies.

The present invention provides a broadband receiver for extracting frequencies by comparing output voltages of different detectors with different characteristics of a filter bank and input frequency bands.

The wide-

An antenna block including a plurality of antennas for receiving input signals of a wideband receiver, which is an unknown signal, in real time;

A broadband power combiner for combining output signals of the plurality of antennas from the antenna block;

A switch block for blocking the output signal and generating a correction antenna output signal by inputting a preset reference signal;

A power divider for distributing the correction antenna output signal; And

And a determination unit for comparing the final output signals calculated by amplifying and filtering the distributed correction antenna output signals to two final output signals adjacent to each other in a time domain and determining the input signals according to a comparison result do.

The discriminator includes a plurality of wide band variable gain amplifiers for varying a gain for the distributed correction antenna output signals to generate amplified input signals; A plurality of filter banks for filtering the amplified input signals according to respective passband characteristics to generate output signals; And a plurality of detectors for converting the power of the output signals into a voltage to generate final output signals.

In addition, the reference signal may be a CW (Continuos Wave) signal.

The reference signal may be a signal corresponding to a center frequency of the plurality of filter banks.

In addition, the antenna block may be a multi-band antenna array.

The input signals of the wideband receiver are LFM (Linear Frequency Modulation) in which the frequency of a CW (Continuous Wave) signal, a pulse modulation signal, and a RF (Radio Frequency) have.

The determination unit may further include a transfer function of the plurality of filter banks to identify input signals of the wideband receiver.

The wideband receiver may further include an amplifier and a variable gain amplifier capable of variably amplifying and applying a signal in consideration of an input dynamic range of the detector at the front end of the filter bank.

 According to the present invention, unlike an existing sweep type broadband receiver, broadband reception of unknown microwave in real time is possible.

In addition, as another effect of the present invention, by using a multi-band antenna having respective frequency bands instead of a wideband single antenna as an array concept, it is possible to design the antenna pattern to be maximally similar to each frequency band. It can be said that it is more advantageous for direction detection when applied to direction detection.

Further, another advantage of the present invention is that it is advantageous in comparison with a conventional sweep type receiver in terms of size, price, and signal processing amount because the configuration is simple.

1 is a conceptual block diagram of a non sweep type analog broadband receiver for real time reception according to an embodiment of the present invention.
2 is a detailed block diagram of the wideband receiver shown in FIG.
3 is a transfer function in the frequency domain of each filter bank shown in Fig.
FIG. 4 is a spectrum in the frequency domain at the front end of a filter bank when an unknown signal according to an embodiment of the present invention is input to a receiver.
FIG. 5 is a graph showing that, when an unknown signal according to an exemplary embodiment of the present invention is input to a receiver, the output from two adjacent filters is output according to transfer function characteristics of the respective filter banks.
6 shows the output of two filter banks adjacent in the time domain for input of a CW (Continuous Wave) signal, a pulse modulated signal, and a pulse modulated signal with LFM (Linear Frequency Modulation) according to an embodiment of the present invention. Fig.

While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail. It is to be understood, however, that the invention is not to be limited to the specific embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

Like reference numerals are used for similar elements in describing each drawing.

The terms first, second, etc. may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another.

For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component. The term " and / or " includes any combination of a plurality of related listed items or any of a plurality of related listed items.

Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the contextual meaning of the related art and are to be interpreted as either ideal or overly formal in the sense of the present application Should not.

Hereinafter, a broadband receiver for real-time reception and analysis of an unknown microwave according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a conceptual block diagram of a broadband receiver for real-time reception of an unknown microwave according to an embodiment of the present invention. 1, the broadband receiver includes an antenna block 10 configured by a plurality of antennas for receiving unknown microwave in real time, a broadband power combiner 104 for combining outputs of a plurality of antennas from the antenna block 10, A switch block 105 for correction, a power divider 107 for distributing the corrected correction antenna output signal, a discriminator 20 for discriminating the frequency, pulse presence and / or modulation of the signal using the distributed signal ), And the like.

The determination unit 20 includes a plurality of broad-band amplifiers capable of varying gain over various stages, a plurality of filter banks having different passband characteristics, and a plurality of detectors for outputting power by switching the power to a voltage . This is shown in FIG. 2, and a detailed description thereof will be omitted.

(Or envelope) of a signal in a dynamic range of a detector in a specific frequency band is detected, and a predetermined voltage value or a predetermined voltage value is determined according to the magnitude of the peak If it is a pulsed carrier, it can be discriminated whether pulse is present or not by using the characteristic of a detector that outputs pulses.

Frequency and LFM can be determined according to the voltage value that is output according to the transfer function after input into two or more filter banks by branching the input signal having a specific frequency and specific power value as described in the following description. However, since the signal is within a 3-dB bandwidth of the bank in a bank according to the frequency bandwidth of the filter bank, the value exists at the maximum output voltage value, and in the peripheral filter bank, May be present. Therefore, it is possible to estimate the frequency, not very precisely, by comparing the output values at that portion with the maximum output voltage values described above. Thus, using more than two filter bank outputs can be more precise.

In other words, when the output voltage of each filter bank is inversely multiplied by the input power value using the transfer function (where the frequency is unknown, only a certain range (predictable within the frequency bandwidth of any filter bank) The frequency can be known by adjusting the predicted frequency so that the result of inversion from the output value to the power becomes equal to the input signal having the specific input value of the specific frequency. LFM is described below.

The switch block 105 may include a reference signal input port (not shown) for inputting a reference signal 11. Further, in order to correct the gain between the filter banks constituting the discrimination unit 20, the signal from the antenna block 10 is cut off by using a switch in advance and the CW (Continuos Wave) signal is applied to each path, and the error between each path is grasped in advance and used for correction. Further, the signal is applied while sweeping the frequency in the entire operating frequency band of the wideband receiver, and the transfer function of each filter bank is derived through the voltage output through the detector. At this time, the transfer function when the gain of the variable gain amplifier is varied is also derived. In each filter bank, the error between each path is known from the relative difference of the transfer function and used for correction.

2 is a detailed block diagram of the wideband receiver shown in FIG. Referring to FIG. 2, the antenna block 10 may be a multi-band antenna array including first through fourth antennas 100, 101, 102, and 103. The first to fourth antennas 100, 101, 102, and 103 have different frequency bands.

The switch block 105 may include a switch 211 for interrupting or connecting the power combiner 104, a reference signal input port 212 for inputting a reference signal, and the like. In addition, the switch 211 cuts off the power combiner 104 for correction and sends the reference signal to the power distributor 107 side via the reference signal input port 212. Of course, a low noise amplifier 106 may be configured between the switch block 105 and the power distributor 107. [

The low noise amplifier 106 is used for the purpose of lowering the noise figure of the whole receiver. Generally, the received power has very low power levels due to attenuation and / or noise. Therefore, amplification is necessary. Since it is a signal that already contains a lot of noise from the outside, the amplification function that minimizes the noise is necessary.

Accordingly, the low-noise amplifier 106 is an amplifier designed by holding an operating point and a matching point so that the noise figure is low.

The discriminator 20 includes first to fourth wideband variable gain amplifiers 108, 109, 110, and 111 for varying the gain of the signal input through the power divider 107 in various stages to generate an amplified input signal, First to fourth filter banks 112, 113, 114 and 115 for filtering output signals in accordance with a passband characteristic of the output signal power and first to fourth detectors 116, 117, 118 and 119 for converting the output signal power into a voltage to generate a final output signal As shown in FIG.

The first to fourth filter banks 112, 113, 114, and 115 are band pass filters.

3 is a normalized transfer function in the frequency domain of each filter bank shown in FIG. Referring to FIG. 3, frequency transfer characteristics of the band-pass filters used in the filter bank are shown. The number of filter banks can be increased to suit the situation to simultaneously receive broadband signals. Here, _Fc1 , _Fc2 , _Fc3 , and _Fc4 represent the center frequency.

FIG. 4 is a spectrum in the frequency domain at the front end of a filter bank when an unknown signal according to an embodiment of the present invention is input to a receiver. 4, a signal as shown in FIG. 4 may be input to input ends of a plurality of filter banks 112 to 115 through a multi-band antenna array (100 to 103 in FIG. 2) and a wideband low-noise amplifier 106 . The bold straight line is a signal at an arbitrary frequency applied to the wideband receiver, and is a signal at the front end of the filter bank.

FIG. 5 is a graph showing that, when an unknown signal according to an exemplary embodiment of the present invention is input to a receiver, the output from two adjacent filters is output according to transfer function characteristics of the respective filter banks. Referring to FIG. 5, there is a conceptual diagram of filter outputs of two adjacent bands when the signal shown in FIG. 4 is received and passed through a filter bank. In the filter 520 having the center frequency F _c1 , the input signal is outputted without loss, but the output 510 of the filter having the center frequency F _c2 spanning the skirt portion of the filter is attenuated according to the transfer function of the filter and is output . In this case, depending on the transfer function of the pulsator and the dynamic range of the detector, there is a case where the final detector voltage is too small or only the influence of the amplification noise is seen. In that case, a wideband amplifier (108-111 in FIG. 2) It is necessary to increase the gain.

6 shows the output of two filter banks adjacent in the time domain for input of a CW (Continuous Wave) signal, a pulse modulated signal, and a pulse modulated signal with LFM (Linear Frequency Modulation) according to an embodiment of the present invention. Fig. Referring to FIG. 6, when various kinds of unknown signals 610 are input, frequencies of a continuous wave (CW) signal, a pulse modulation signal, and an RF (Radio Frequency) The output 620 of two adjacent filter banks in the time domain is displayed for the input of the pulse modulated signal with LFM (Linear Frequency Modulation).

The output voltage of the filter varies depending on the transfer function of the filter. When the input is pulse-modulated, a pulse is output. In this case, the peak voltage of the pulse depends on the transfer function of the filter bank.

In other words, knowing the transfer function of the filter and the voltage value output from two or more filter banks makes it possible to predict the frequency of the signal coming into the antenna. In the case of the LFM signal, if the skirt characteristic of the transfer function is used, the peak value of the output voltage linearly increases or decreases.

10: Antenna block
11: reference signal
20:
100: first antenna
101: Second antenna
102: third antenna
103: Fourth antenna
104: power combiner
105: Switch block
106: Low Noise Amplifier
107: Power distributor
108: first variable gain amplifier
109: second variable gain amplifier
110: third variable gain amplifier
111: fourth variable gain amplifier
112: first filter bank
113: second filter bank
114: third filter bank
115: fourth filter bank
116: first detector
117: second detector
118: Third detector
119: fourth detector

Claims (4)

An antenna block including a plurality of antennas for receiving input signals in real time;
A broadband power combiner for combining output signals of the plurality of antennas from the antenna block;
A switch block for blocking the output signal and generating a correction antenna output signal by inputting a preset reference signal;
A power divider for distributing the correction antenna output signal; And
A discriminator for comparing the final output signals calculated by amplifying and filtering the distributed correction antenna output signals to two or more final output signals having adjacent frequency bands in the time domain and discriminating the input signals according to the comparison result; ≪ / RTI &
Wherein,
A plurality of wide band variable gain amplifiers for varying gains of the distributed correction antenna output signals to generate amplified input signals;
A plurality of filter banks for filtering the amplified input signals according to respective passband characteristics to generate output signals; And
And a plurality of detectors for converting the power of the output signals to voltages to generate final output signals,
Wherein the discriminator uses transfer functions of the plurality of filter banks to discriminate input signals of a wideband receiver,
Whether or not there is a specific frequency of the input signals, presence or absence of a pulse, or modulation,
The presence or absence of the specific frequency is determined by detecting a peak value of a signal in a dynamic range of a detector in a specific frequency band,
The presence or absence of the pulse is determined by a difference between the output voltages of the filter banks depending on the transfer function of the filter bank and the peak voltage of the pulse varies according to the transfer function.
The modulation is determined by linearly increasing or decreasing the peak value of the output voltage according to the skirt characteristic of the transfer function,
Wherein each passband characteristic is different for each filter bank,
Wherein the transfer function is a normalization transfer function in a frequency domain of each filter bank and the output voltage is inversely multiplied by an input power value through the transfer function.
delete The method according to claim 1,
Characterized in that the antenna block is a multi-band antenna array. delete

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